I found that the Optional DTMF Yaesu microphone I bought causes troubles, that do not occur with the supplied no frills mic. ie Keying up on 28 megs locks the transmitter ON Is it RF feedback?The no frills one does not do that!

On 80m I get severe distortion and breakup, making the transmission unreadable, but the no frills is good audio.

I have seen other references to these problems and wonder if it is wide spread or any fixes.

I am not familiar with the 897, but it sounds like you have a similar problem that I had with the 857. The DTMF mic is hot on the audio. I had to set the SSB mic gain to 2 as I was getting ALC spikes and reports of broken audio. I set the FM mic gain to 20.

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